/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.coders;



import com.bff.gaia.unified.sdk.values.TypeDescriptor;

import com.bff.gaia.unified.sdk.values.TypeParameter;



import java.util.ArrayList;

import java.util.List;



/**

 * An {@link IterableCoder} encodes any {@link Iterable} in the format of {@link IterableLikeCoder}.

 *

 * @param <T> the type of the elements of the iterables being transcoded

 */

public class IterableCoder<T> extends IterableLikeCoder<T, Iterable<T>> {



  public static <T> IterableCoder<T> of(Coder<T> elemCoder) {

    return new IterableCoder<>(elemCoder);

  }



  @Override

  public Object structuralValue(Iterable<T> value) {

    ArrayList<Object> result = new ArrayList<>();

    for (T elem : value) {

      result.add(getElemCoder().structuralValue(elem));

    }

    return result;

  }



  /////////////////////////////////////////////////////////////////////////////

  // Internal operations below here.



  @Override

  protected final Iterable<T> decodeToIterable(List<T> decodedElements) {

    return decodedElements;

  }



  protected IterableCoder(Coder<T> elemCoder) {

    super(elemCoder, "Iterable");

  }



  @Override

  public TypeDescriptor<Iterable<T>> getEncodedTypeDescriptor() {

    return new TypeDescriptor<Iterable<T>>() {}.where(

        new TypeParameter<T>() {}, getElemCoder().getEncodedTypeDescriptor());

  }

}